Step1.Go to the Curse website and download the Gatherer add-on. This add-on will show you where all of the mines, treasure chests and herbs are in each area so that you can farm them quickly to sell in the action house. You can adjust the heat trail to show you the circuit you used to gather so that you can follow that circuit again later.
Step2.Download the Auctioneer add-on while you are at the Curse website. This will show you how much items in the auction house are selling for so that you can price your items competitively.
Step3.Raid low level instances such as Sunken Temple (if you are level 70) by yourself to get good blues to sell in the auction house or to sell to vendors. One run like this can get you around 20 gold.
Step4.Do the PvP quests every day for 11 gold each. These quests can be found in Hall of the Brave.